selecting null values in oracle

It is permissible to combine ORDER BY on the outer query with ORDER BY in N...

It is permissible to combine ORDER BY on the outer query with ORDER BY in NULLS FIRST: Specifies that NULL values should be returned before non-NULL.

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The Oracle / PLSQL NVL function lets you substitute a value when a null val...

The Oracle / PLSQL NVL function lets you substitute a value when a null value is SELECT supplier_id, NVL(supplier_desc, supplier_name) FROM suppliers;.

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If you want to include NULL values, do one of the following: In Oracle, nul...

If you want to include NULL values, do one of the following: In Oracle, null is not considered a legal value to select unless you explicitly ask.

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SELECT COUNT (*) FROM TABLE WHERE COL_NAME IS NULL. The other two You can n...

SELECT COUNT (*) FROM TABLE WHERE COL_NAME IS NULL. The other two You can not count nulls (at least not in Oracle). Instead try.

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In the example above, if any of the "UnitsOnOrder" values are NUL...

In the example above, if any of the "UnitsOnOrder" values are NULL, the result will be Oracle. The Oracle NVL() function achieves the same result: SELECT.

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SQL> SELECT * FROM null_test_tab WHERE col1 = NULL ORDER BY id; no rows ...

SQL> SELECT * FROM null_test_tab WHERE col1 = NULL ORDER BY id; no rows The NVL function allows you to replace null values with a default value.

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However, they're quite different in how they handle NULL values and ma...

However, they're quite different in how they handle NULL values and may give select 'true' from dual where exists (select null from dual);.

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Oftentimes, a query will return null values for some of the columns in a qu...

Oftentimes, a query will return null values for some of the columns in a query. However, to display "null" as the value in the generated report.

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I decided to develop a little test case just to show what is going on with ...

I decided to develop a little test case just to show what is going on with NULLs. Let?s take a look at this test case: SQL> create table test as select * from.

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How to index NULL to improve SQL performance for “where IS NULL” A row that...

How to index NULL to improve SQL performance for “where IS NULL” A row that does not have a DATE_OF_BIRTH value is not added to this index. SELECT first_name, last_name FROM employees WHERE date_of_birth IS NULL.

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I've been asked about counting NULL values several times so I'm g...

I've been asked about counting NULL values several times so I'm going to blog SELECT COUNT(1) - COUNT() It is much better to use Oracle SQL Singel-row General function NVL, who.

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MIN will return the smallest non-NULL value. The query won't throw an ...

MIN will return the smallest non-NULL value. The query won't throw an error, it will simply ignore the NULL values. SQL> with x as (2 select.

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Can someone tell me how to query for a null value in a multi-record block? ...

Can someone tell me how to query for a null value in a multi-record block? e.g in the item master form, I want to look for those items.

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Sometimes, when writing a query, you don't want to return a NULL value...

Sometimes, when writing a query, you don't want to return a NULL value. This is particularly important during concatenation where the.

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July 29, Another interesting thread appeared on the OTN forums this week. T...

July 29, Another interesting thread appeared on the OTN forums this week. The original poster in the thread stated that Oracle Database.

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